Vulnerability in Node-oauth Node-oauth2-server

CVE-2026-41213

@node-oauth/oauth2-server is a module for implementing an OAuth2 server in Node.js. The token exchange path accepts RFC7636-invalid code_verifier values (including one-character strings) for S256 PKCE flows. Because short/weak verifiers ar…

EPSS: 0.002 (36.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.

Affected products

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-41213?
CVE-2026-41213 is a medium-severity vulnerability in Node-oauth Node-oauth2-server, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 5.9/10. Published 2026-04-23.
How severe is CVE-2026-41213?
Medium severity. CVSS v3 base score is 5.9 out of 10.